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Joel Allison · Answer 1 · 2022-06-13T20:43:19+0000

So here, for basically any quadratic function, the domain is:
$x \in \mathbb{R}$ .

Now right off the bat, that means C and D are out.

Also, since this graph has a negative sign in front of the x^2, that means it is facing downwards and so it has a maximum. The only option that leaves us with is A.

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